Micro channel unit

Abstract

A micro channel unit having a shape designed to reduce a pressure drop when fluid passes through a connecting channel portion is provided. The micro channel unit includes a micro channel with a width of micrometer dimensions through which liquid flows. The micro channel includes a plurality of straight channel portions and connecting channel portions that connect each pair of adjacent straight channel portions. The connecting channel portions are wider than the straight channel portions connected by the connecting channel portions. The use of the micro channel unit can reduce the pressure drop when fluid passes through the connecting channel portions, thereby reducing the amount of power required to drive the fluid flow and further enabling miniaturization of microfluidic devices such as pumps and peripheral devices.

1. A micro channel unit comprising:
 a micro channel with a width of micrometer dimensions through which liquid flows, the micro channel comprising:  
 a plurality of straight channel portions extending in a straight line pattern; and  
 at least one connecting channel portions that connects each pair of adjacent straight channel portions, the connecting channel portions being wider than the straight channel portions connected by the connecting channel portions;  
 wherein the connecting channel is adapted to change flowing direction of the liquid in an angle in the range of 90 degrees to 180 degrees.  
 
   
   
     2. The micro channel unit of  claim 1 , wherein each connecting channel portion becomes progressively wider from one of two adjacent straight channel portions connected by the connecting channel portion, toward the other straight channel portion, and is widest in a middle portion. 
   
   
     3. The micro channel unit of  claim 2 , wherein the shape of the connecting channel portion is curved.